ACOUSTIC WAVE DEVICE AND MULTIPLEXER

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ACOUSTIC WAVE DEVICE AND MULTIPLEXER

This abstract first appeared for US patent application 18829753 titled 'ACOUSTIC WAVE DEVICE AND MULTIPLEXER

Original Abstract Submitted

A filter includes an acoustic wave resonator including a piezoelectric substrate and an IDT electrode. The piezoelectric substrate includes a piezoelectric layer, a low acoustic velocity layer, and a high acoustic velocity layer. An intersection region of the IDT electrode includes a central region and an edge region. The IDT electrode includes a mass addition film in the edge region. A duty of the IDT electrode and a cut-angle θ° of the piezoelectric layer satisfy any one or more of 0.513≤D≤0.568 and 2.5≤θ≤17.5, 0.538≤D≤0.568 and 17.5≤θ≤22.5, 0.538≤D≤0.588 and 42.5≤θ≤52.5, 0.538≤D≤0.613 and 52.5≤θ≤67.5, 0.513≤D≤0.638 and 67.5≤θ≤77.5, and 0.513≤D≤0.713 and 77.5≤θ≤92.5.